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import pytest
from rdflib import Graph, Literal, Variable
query_tpl = """
SELECT ?x (%s(?y_) as ?y) {
VALUES (?x ?y_ ?z) {
("x1" undef 1)
("x1" undef 2)
("x2" undef 3)
("x2" 42 4)
}
} GROUP BY ?x ORDER BY ?x
"""
Y = Variable("y")
def template_tst(agg_func, first, second):
g = Graph()
results = list(g.query(query_tpl % agg_func))
print("===", results)
assert results[0][1] == first, (results[0][1], first)
assert results[1][1] == second, (results[1][1], second)
def get_aggregates_tests():
yield template_tst, "SUM", Literal(0), Literal(42)
yield template_tst, "MIN", None, Literal(42)
yield template_tst, "MAX", None, Literal(42)
# yield template_tst, 'AVG', Literal(0), Literal(42)
yield template_tst, "SAMPLE", None, Literal(42)
yield template_tst, "COUNT", Literal(0), Literal(1)
yield template_tst, "GROUP_CONCAT", Literal(""), Literal("42")
@pytest.mark.parametrize("checker, agg_func, first, second", get_aggregates_tests())
def test_aggregates(checker, agg_func, first, second) -> None:
checker(agg_func, first, second)
def test_group_by_null():
g = Graph()
results = list(
g.query(
"""
SELECT ?x ?y (AVG(?z) as ?az) {
VALUES (?x ?y ?z) {
(1 undef 10)
(1 undef 15)
(2 undef 20)
(2 undef 21)
(2 undef 24)
}
} GROUP BY ?x ?y
ORDER BY ?x
"""
)
)
assert len(results) == 2
assert results[0][0] == Literal(1)
assert results[1][0] == Literal(2)
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